<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>myBind</title>
</head>
<body>
<script>
    Function.prototype.myBind = function (obj, ...arg) {
        const self = this
        return function () {
            self.call(obj, ...arg, ...arguments)
        }
    }

    const obj = {name: "obj.name"}
    var name = "window.name"

    function show() {
        console.log(this.name)
    }

    console.log("++++++++++++++++++")
    show()
    console.log("++++++++++++++++++")
    show.bind(obj)();
    console.log("++++++++++++++++++")
    show.myBind(obj)();
    console.log("++++++++++++++++++")

</script>
</body>
</html>
